News

2015 - 100th Anniversary of the 1915 Lassen Peak Eruption

On May 22, 1915, an explosive eruption of Lassen Peak produced a pyroclastic flow northeast of the summit that devastated a 3.7 mile swath of the landscape—now called Devastated Area in Lassen Volcanic National Park. This explosion was the most powerful in a 1914-17 series of eruptions that were the last to occur in the Cascades before the 1980 eruption of Mount St. Helens, Washington.

Prepare

NVEWS
The National Volcano Early Warning System plans to
closely monitor threatening volcanoes.